The generalised flow equation satisfied by \(\Gamma _k[\phi ]\)  is given by [1]}
\( \left( \partial _t + \Psi _k[\phi ] \cdot \frac{\delta }{\delta \phi } \right) \Gamma _k[\phi ]= \frac{1}{2} {\rm Tr}\, \mathcal {G}_k[\phi ] \left( \partial _t + 2 \cdot \frac{\delta }{\delta \phi } \Psi _k[\phi ] \right)\cdot \mathcal {R}_k \,,\) 
